Padlock.



PATENTED JAN. 28, 1908.

LG. sNoOK.

PADLOGK.

APPLIO'ATION FILED JULY 1. 1907.

FRANK G. SNOOK, OF SACRAMENTO, CALIFORNIA.

PADLOCK.

Specification of Letters Patent.

Patented Jan. 28, 1908.

Application filed July 1. 1907. Serial No. 381.641.v

T o all whom it may concern:

Beit known that 1, FRANK G. SNooK, a citizen ofthe United States, residing at Sacramento, in the State of California, have invented new and useful Improvements in Padlocks, of which the following is a specification.

This invention relates to certain new and useful improvements in that type of locks known as pad-locks having a sliding-shackle and wherein means are provided for trapping the key after unlocking the shackle whereby the key cannot be removed from the lock without first restoring the parts to their normal interlocked position.

The object of the invention is to provide a simple, strong, and secure lock of the padlock type designed for securing one part to another and to provide against the closing of one of the parts relative to the other without insuring the proper locking of the two parts.

The invention consists of the parts, and the constructions and combinations of parts whichl will hereinafter describe and claim. 1n the accompanying drawings forming part of this speciiication and in which similar letters of reference indicate like parts in the several views, Figure l is a plan view of a pad-lock embodying my invention and showing the face plate removed and the key in position. Fig. 2 is a sectional view on the line 1-1 of Eig. 1. Fig. 3 is a view of the key detached.

In carrying out my invention 1 construct the lock of three essential parts, namely the case A, the shackle B, said case containing complementary mechanism for locking the shackle in place, and a key which is designed to release the shackle to allow one part to be withdrawn from the other said key adapted to be trapped by the lock mechanism and to be released only by the restoring of the shackle to its normal position in the lock case.

The lock case, A, is of the usual construction and has a face plate A with a key hole adapted to receive the operating key, said case having a rigid stud 1() projecting from one side adapted to receive the barrel of the key and form the axis about which thekey is turnable. The lock case, A, is provided with suitable parallel guides, 1 1, for the arms of the shackle B, said arms having their lower ends preferably beveled and having above said ends, suitable slots or recesses 12.

Slidably mounted in the lock-case is ayoke,

13, of substantially U-shape except that its middle portion is depressed or formed on an arc the cepter of which is the post or pin, 10, about which the key turns, said curved portion being provided with a ange 14k adapted to engage the key when the shackle is withdrawn and thereby trap said key and prevent its removal from the lock until the shackle has been restored to its normal position. When the shackle is in place, the yoke is depressed against the ions or springs, 15, yoke and the lock to proj ect the yoke to bring its curved iiange, 14, into the range of action of the bits of the key when the lock mechanism has been moved by the key to release the shackle and the shackle is in condition to be withdrawn from the lock case.

Suitably mounted in the lock-case upon pivots or studs, 16, are the double-armed dogs, 1.7 and 18, one of these dogs being arranged on `each side of the longitudinal center of-the case. The longer arms ofthe dogs are provided with hook-shaped portions 19 which extend in opposite directions and these hook-shaped portions are so arranged that when the shackle is withdrawn they project into the plane of the guides, 11, whereby when the shackle is inserted into the lock case the ends of its arms first strike the curved surfaces of the hooksshaped portions, 19, and force the dogs inwardly against the pressure of a spring, 20, mounted upon a stud, 21, and having itsopposite ends to bear upon the long arms of the dogs or levers. The short arms of the dogs or levers are provided with notches, 22, adapted to be engaged by the straight sides, a, of the bits of the key C, said bits having curved outer faces, t, adapted to ride in contact with the dogs to thereby cause the hook-shaped ends of the dogs to be moved in the reverse direction and to be withdrawn from engagement with the arm of the shackle. The straight sides of the notches in the dogs by engaging the straight sides of the bits prevent the key from being turned backwards. When the key is thus in engagement with the notches of the dogs it is crosswise of the key slot in the face plate and of course cannot be removed.

The bits of the key are also provided with slots or grooves, 23, which are adapted to ride into engagement with the curved flange of the spring pressed yoke, 13, so that if the bits are now turned from their position introduced between said action of suitable cush-4 case, said springs serving crosswise to the key slot to bring the bits into register with the slot formed in the face plate, the groove in one of the bits will ride into engagement with the curved flange, 14., formed on the spring-pressed yoke, and which yoke has been allowed to move towards the key by the unlocking of the dogs from the arms of the shackle, to thereby trap the key or prevent it being removed from the case until the spring yoke has again been moved to its normal position, which action occurs only when the shackle has been pressed inwardly so that its arms will engage the arms of' the yoke and force said yoke backwardly to its normal position to carry the curved flange of said yoke out of engagement or beyond the plane ofthe bits of the key.

ln operating the lock and assuming that the shackle is in place and engaged by the lock-mechanism, the key is first inserted through the slot in the face-plate of the lock and turned say to the right. The curved faces of the bits now engage the dogs at a point below or at one side of their pivotal center and thus turn the dogs so that their opposite ends which carry the hook-shaped projections will be moved inwardly towards each other to withdraw said projections from the slots or recesses in the arms of the shackle. As soon as this has been accomplished the spring-pressed yoke, 13 is permitted to move and in its movement it starts the shackle out of the lock-case far enough to bring the slots or recesses in the arms of the shackle substantially out of register with the hookshaped projections of the pivoted levers or dogs and at the same time bring the curved flange of the yoke, 13, into the range of action of the bits of the key so that if the key is further turned, the groove or slot in its bits will ride into engagement with said flange and the key will be prevented from being pulled out of the lock case, even when the bits are brought into register with the slot in the face plate of said case. The shackle may now be pulled out of the lock case and when this is accomplished the spring, 20, causes the pivoted levers or dogs to project their hook-shaped ends into the path of the guides in the lock-case through which the arms of the shackle pass so that when the shackle is again inserted the arms thereof will first strike the curved faces of the hook-shaped projections and force the do s or levers inwardly towards each other to flow the ends of the shackle to pass and en gage the arms of the spring-pressed yoke, 13.

A further pressure upon the shackle results in the yoke, 13, being forced back to its seat thereby carrying the curved flange, 14, outside ofthe plane ofthe ends ofthe bits ofthe key and allowing the slots or recesses in the arms of the shackle to be brought into register with the hook-shaped projections of the pivoted levers or dogs, so that said projecu tions may spring into the slots of said arms possible for the two parts of the lock to be improperly connected, for in no event can the key be withdrawn after-.the lock has once been opened and the `shackle removed, until said shackle has been again accurately restored to its normal position in the lock-case. The shackle seats the spring-pressed yoke which untraps the key and the springressed yoke starts the shackle out of the ock case when the shackle is unlocked and also places itself in a position where it traps the key and maintains said key trapped until the shackle is again inserted.

The lock lis strongly` made and has but a few parts and is well adapted for securing the hasps lor other fixtures of doors or other structures, the parts being so arranged that after a key is once inserted and the shackle unlocked the key cannot be withdrawn for any purpose until the two parts of the lock have been' again assembled and interlocked.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is

1 In a lock, he combination of the case, a shackle slidably-mounted therein, .springpressed dogs within the case having means for engaging and interlocking with the arms of the shackle, said .dogs adapted to be actuated by a key to release the shackle, and a spring-pressed yoke slidably-mounted within the lock case and adapted to be depressed by the shackle and to remain in normal engagement with said shackle, said yoke adapted to start the shackle out of the case when the locking dogs are released from engagec ment with the shackle, and said yoke having a member which is advanced towards the key and engages and traps said key cordinately with the release of the shackle, said trap ing-means holding the key trapped until t e shackle is returned to normal position.

2. The combination of a lock-case havin 'parallel guides, a shackle having paralle arms slidably fitting said guides, and provided with slots or recesses, a yoke slidably mounted in the ycase and ada ted to be engaged by the ends of the shac e-arms and to be held depressed and under tension when the shackle is in locked position, s ringpressed dogs-'pivotally-mounted in sai case and having hook-shaped ends to engage the slots or recesses in the shackle-arms, said dogs adapted to be actuated by a key to withdraw their hook-sha ed ends out of engagement with the shackle, said yoke then operating to slightly advance the shackle and thereby carry the slots out of register with. said hook-shaped ends, and said yoke having, also, means for tra ping the key coordinately with the unloc ring of the shackle and holding said key trapped until the shackle is again restored to normal position.

3. The combination of a lock-case having a substantially U-shaped yoke slidably-mounted in one end thereof, springs or cushions between said yoke and the lock case, pivotallymounted locking-dogs Within the lock-case having hook-shaped ends, said dogs bein spring-pressed, a shackle having paralle arms slidably fitting the lock-case, the inner ends of said arms adapted to engage the arms of the yoke to depress said yoke against the action of said springs, said shackle having ren cesses adapted to be engaged .by the dogs when brought into register therewith and said dogs adapted to be retracted by a key to remove their hook-shaped ends out of engagement with the shackle, said yoke having a curved flange adapted -to be moved into the range of action of the bits of the key to trap said key cordinately with the release of the shackle and to hold the key trapped until the shackle is again restored to normal position.

4. The combination with a shackle having parallel arms and locking recesses, of a lockcase having guides for said arms, and having locking means for engaging the recesses of the arms, said case having a spring-pressed yoke which is normally depressed by the shackle and which is advanced cordinately with the release of the shackle and has means for trapping the actuating key and holding said key trapped during the entire period the shackle is released, said shackle adapted to engage and restore the yoke to normal position and simultaneously release the key.

In testimony whereof I have hereunto set my hand in presence of two subscribing witf nesses.

FRANK G. SNOOK.

Witnesses:

T. W. FowLER, C. W. FOWLER. 

